App.jsx

import React from "react";
import StockTable from "./StockTable";

import StockChart from "./StockChart";

class App extends React.Component {
  state = {
    selectedStock: null
  };
  render() {
    const { stocks } = this.props;
    const { selectedStock } = this.state;
    return (
      <React.Fragment>
        <StockTable
          stocks={stocks}
          onSelect={selectedStock => this.setState({ selectedStock })}
        />
        {selectedStock && (
          <StockChart
            stock={selectedStock}
            onClose={() => this.setState({ selectedStock: false })}
          />
        )}
      </React.Fragment>
    );
  }
}

export default App;